What Can Help My Interstitial Cystitis? I Am Always Dehydrated

What can help my interstitial cystitis? I am always dehydrated and I drink over a gallon of water daily. Is the dehydration connected to the severe pain of the cystitis? I take several medications for several conditions I suffer from. I'm treated for severe vertigo, arthritis, fibromyalgia? For almost 18 months the cystitis was under control by taking aloe Vera capsules in large quantity. But suddenly severe pain returned. Trying to control with peridium.